Process of making carbon and other coated papers



Patented'Mar. 16, 1926.

UNITED sures 1,576,601 PATENT. OFFICE.

ALFRED HAIGH, F STAFFOBD SHIBE, ENGLAND.

PROCESS OF MAKING CARBON AND OTHER COATED PAPERS.

certain new and useful Improvements in Processes of Making Carbon and Other Coated Papers, of which the following is a specification.

This invention relates to improvements inand relating to carbon and other coated papers and carbonizing papers and refers primarily to the so-called carbon-papers such as are used for duplicating purposes upon .typewriting machines in salesmens books and for other purposes and in whichone or both sides or surfaces are coated with the desired composition.

The present invention relates to papers ofthe above character in which only one side or surface is coated.

The term carbonizing papers used herein is intended to apply to the plain or untreated paper.

In the manufacture of carbon papers as at present generally conducted the paper in the form of a continuous web of thin paper is first coated and afterwards cut up into is sheets of the desired dimensions. In view of the thinness of the paper a certain amolmt of care is required in the handling thereof in order to avoid tearing or.

damaging same, and further 'care is necessary to prevent the composition from getting upon that side of the paper which is to remain untreated.

Where a thin paper is employed, such as that referred to, it frequently happens that there are small holes in said paper through which the coating material will pass to the back of the sheet and extend more or less thereover, in which case not only does the paper stick to the rollers but the coating composition thus conveyed to the rollers will set off or stain the paper which follows.

The present invention has for its object to overcome the aforesaid objections attending the present method of manufacture of carbon papers, and further to simplify-and expedite the production of such paper.

According to the present invention instead of employing a single sheet of paper two sheets are employed which are secured together throughout the whole of their contacti surfaces in any suitable manner such .as enablethem'to be afterwards readily separated, one or both of the outer surfaces in two the 7, 1922. Serial No. 586,772.

slred composition.

The composition can be applied first to one side of the paper and then to the other separate operations or both sides of .the paper may be simultaneously coated by any of the methods employed or capable of being employed sided carbon paper.

By this means two carbon sheets may be for producing a double produced instead of one, and further anv risk of the composition passing through holes in the paper and extending to the uncoated surface is prevented.

The papers may be both of the same weight orthickness or one paper may be heavier than the other.

The attachment of the papers one to another may be eifected by bringing the sheets or webs of paper together whilst one is in a moist condition and causing'themto adhere by pressure. 1

The utility of the present invention lies not only inthe reduction of cost when the two papers are coated together but also in greater ease withwhich the double paper handled, and further again in that when this invention is used there is no possibility of surplus composition deposited accidental or plain side of the paper in the paper or otherwise. 1

paper covers any pin-holes on the paper which is being coated.

If desired this second paper may be left on the carbon paper as distributed or used thus acting as a. fixed interleaving paper.

Any other coating process besides carbonmay be used or applied to this paper.

0 h z 1 ding f 1. process inc u supe o ace to face webs of thin carbonizing pip hi suitable for making typewriter carbon paper; expressing the air from between said webs; moistening the webs and causing the superposed webs to intimately cohere at the e es thereof and continuously from edge toedlge throughout in a manner to rmit the rea y separation of the webs wit out tearing the webs, andin amannertosealpinho the webs and to prevent the inflow .of carbonizing coating material between the webs through the web or at the edges thereof; coating the exposed faces of said webs with carbonlzing coating material while the papers are thus intimately superposed; and permanently separating the webs.

2. A process including moistening and superposing webs of paper; pressing said webs together for causing said webs to cohere in a manner to permit ready separation of the webs; and while the webs are still eoher'ed coating the exposed face of one of the webs with carbon for forming copying paper.

3. The herein described process for coating paper which, consists in moistening two webs of paper, placing the webs while in moist condition the one upon the other and pressing them together to cause the webs to adhere the one to the other throughout the whole of their contacting surfaces for the full length of the webs in such manner as to permit subsequent separation of the Webs, and applying the coating to the outer surface of one of the webs while the webs are adhered together.

In testimony whereof I have hereunto set my hand.

ALFRED HAIGH. 

